AM29LV320DB90REF datasheet(12/57 Pages) AMD

12 / 57 page

Am29LV320D

December 14, 2005

DA TA SH EET

DEVICE BUS OPERATIONS

This section describes the requirements and use of

the device bus operations, which are initiated through

the internal command register. The command register

itself does not occupy any addressable memory loca-

tion. The register is a latch used to store the com-

mands, along with the address and data information

needed to execute the command. The contents of the

The state machine outputs dictate the function of the

device. Table 1 lists the device bus operations, the in-

puts and control levels they require, and the resulting

output. The following subsections describe each of

these operations in further detail.

Table 1.

Am29LV320D Device Bus Operations

Legend: L = Logic Low = V

IL, H = Logic High = VIH, VID = 11.5–12.5 V, VHH = 11.5–12.5 V, X = Don’t Care, SA = Sector Address,

IN = Address In, DIN = Data In, DOUT = Data Out

Notes:

1. Addresses are A20:A0 in word mode (BYTE# = V

IH), A20:A-1 in byte mode (BYTE# = VIL).

2. The sector protect and sector unprotect functions may also be implemented via programming equipment. See “Sector/Sector

Block Protection and Unprotection” on page 17.

3. If WP#/ACC = V

IL, the two outermost boot sectors remain protected. If WP#/ACC = VIH, the two outermost boot sector protection

depends on whether they were last protected or unprotected using the method described in “Sector/Sector Block Protection and

Unprotection” on page 17. If WP#/ACC = V

HH, all sectors are unprotected.

4. D

IN or DOUT as required by command sequence, data polling, or sector protection algorithm.

Operation

CE#

OE#

WE#

RESET#

WP#/ACC

Addresses

(Note 2)

DQ0–

DQ7

DQ8–DQ15

BYTE#

= V

BYTE#

= V

Read

L/H

OUT

DQ8–DQ14

= High-Z,

DQ15 = A-1

Write

(Note 3)

(Note 4) (Note 4)

Accelerated Program

(Note 4) (Note 4)

Standby

CC ±

0.3 V

CC ±

0.3 V

High-Z

Output Disable

L/H

High-Z

Reset

L/H

High-Z

Sector Protect (Note 2)

L/H

SA, A6 = L,

A1 = H, A0 = L

(Note 4)

Sector Unprotect

(Note 2)

(Note 3)

SA, A6 = H,

A1 = H, A0 = L

(Note 4)

Temporary Sector

Unprotect

(Note 3)

(Note 4) (Note 4)

High-Z

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